Composite resin casting mold and manufacturing method thereof

Abstract

The invention discloses a composite resin casting mold and a manufacturing method thereof, which is characterized in that: it comprises a base mold, a primer layer and a wear-resistant layer, the material of the primer layer is epoxy resin; the material of the wear-resistant layer is Modified polyurethane. Compared with the prior art, the beneficial effect of the present invention is: save the process of the mother mold that is made of female mold and / or male mold, can direct numerical control machine tool to process casting wood mold or base mold with other non-metal molds ( That is, casting foundry mold), adding diluent, hardening agent and nano-alumina to polyurethane can not only improve the wear resistance and hardness of polyurethane, but also reduce the viscosity of polyurethane, prolong the gel time, and still maintain the Shore hardness. Up to 65~70D, this superior performance enables all air and airless spraying equipment and even ordinary watering cans to spray smoothly. During the secondary CNC finishing process of the wear-resistant layer, the polyurethane material produces cuts and threads, no dust, and is environmentally friendly and pollution-free.

Description

technical field [0001] The invention belongs to the technical field of mold processing, and in particular relates to a composite resin casting mold. Background technique [0002] At present, the molds used in the foundry industry at home and abroad are mostly metal molds, resin molds, wooden molds, and foam molds. About 200 times, especially the surface of the wood mold is sprayed / brushed mostly with nitro, alkyd and other paints, which have no wear resistance; although the metal mold is wear-resistant, it is not anti-corrosion and moisture-proof, especially in winter. Easy to stick to sand, long production cycle, high production cost and other disadvantages; although polyurethane mold (resin mold) has the advantages of wear resistance, anti-corrosion and moisture-proof, and non-sticky sand in winter, it also has cumbersome production process, large environmental pollution, long production cycle, and high production cost. Disadvantages such as high cost, the cumbersome mast...

AI Technical Summary

Problems solved by technology

[0002] At present, the molds used in the foundry industry at home and abroad are mostly metal molds, resin molds, wooden molds, and foam molds. About 200 times, especially the surface of the wood mold is sprayed / brushed mostly with nitro, alkyd and other paints, which have no wear resistance; although the metal mold is wear-resistant, it is not anti-corrosion and moisture-proof, especially in winter. Easy to stick to sand, long production cycle, high production cost and other disadvantages; although polyurethane mold (resin mold) has the advantages of wear resistance, anti-corrosion and moisture-proof, and non-sticky sand in winter, it also has cumbersome production process, large environmental pollution, long production cycle, and high production cost. Disadvantages such as high cost, its cumbersome master mold composed of female mold and / or male mold, production time, materials, long delivery cycle and other shortcomings; the whole process of density board processing and production produces dust, which pollutes the environment

[0003] Such as coating polyurethane on the surface of the original non-metallic casting mold can effectively make up for the deficiencies of the above-mentioned various conventional molds, but the polyurethane material used in the prior art has a viscosity of about 5000-5500mPa s after mixing materials A and B, and the viscosity It is very high, and the gel time is only 15~20 minutes. Therefore, if you want to apply polyurethane directly on the surface of non-metallic casting molds, you can only paint it by hand, which is laborious and laborious.

At present, both air and airless spraying equipment cannot be sprayed.

If diluent is added to polyurethane, although it can be sprayed, the hardness and wear resistance are not enough

At present, although there are many types of polyurethane or polyurea at home and abroad, there is still no polyurethane that is suitable for casting mold spraying and maintains performance.